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Lightmill

These blades are white on one side and black on the other. They are placed in a glass chamber filled with gas at very low pressure.

Why does the lightbulb make the blades rotate?

The black side of the blades heats up more than the white sidePhotons from the light bulb push the blades aroundThis can only work if the blades are driven by a motor powered by solar panelsThe light increases the temperature inside of the glass chamber